It's true that some fish species practice "brood parasitism," where they lay their eggs in the nests of other fish, who then unwittingly raise the young. However, swordfish are not known to do this.
Instead, swordfish are pelagic spawners, meaning they release their eggs into the open ocean. The eggs hatch into larvae which are tiny and vulnerable. They primarily feed on zooplankton (microscopic animals like copepods) and other small organisms.
As the larvae grow, they eventually develop into juveniles that prey on larger organisms like small fish and squid.
While mother swordfish do not eat their young, they do not actively provide care for them after spawning. The young swordfish must fend for themselves in the vast ocean.
It's worth noting that the young swordfish face many challenges in their early life, including predation, competition for food, and the harsh conditions of the open ocean. Only a small percentage of them will survive to adulthood.